William e



(ModeL) W. E. SPARKS.

Chain Bolt.

Patented June 7,1881.

PFIERS. FhOh-Liihcgnpher, Wilmington, [L C.

ITED STATES PATENT OFFICE.

WILLIAM E. SPARKS, OF BRITAIN, CONNECTICUT, ASSIGNOR TC P.

& F. CORBIN, OF SAME PLACE.

CHAIN-BOLT.

SPECIFICATION forming part of Letters Patent No. 242,568, dated June 7, 1881.

Application filed October 11, 1880. (Model) T 0 all whom it may concern Be it known that I, WILLIAM E. SPARKS, of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Chain-Bolts, of which the following is a specification.

My invention relates to improvements in chain-bolts in which the chain is secured to the bolt-case by means of a swinging lever having a flanged stud projecting at right angles to said lever, which passes through an eye in the front of the case into a chamber between said front and the bolt proper, the other end .of which chain is fastened to the door-boltkeeper; and the objects of my invention are to furnish a secure and efficient fastening in a practical form, and to so construct the same thatitmay be attached to and used in combination with a door-bolt, and that it may he cheaply produced. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a front elevation. front elevation of the bolt and its case with the chain detached therefrom. Fig. 3 is a rear view of the chain-lever, and Fig. 4 is a side elevation of said lever.

The keeper A, chain B, bolt 0, and its case D (except in the particular hereinafter more fully described) may be of any ordinary form and construction. In the front of the case D I form an eye, to, having unequally-shaped notches upon its two opposite sides, as shown in Fig. 2. This eye extends through the front plate of the case into an open chamber behind said plate. I secure a swinging lever, E, to the chain B, which lever is provided with a stud, b, of a size to fit the central or round part of the eye a, but is small enough so that it may turn freely therein. Upon the inner end of the stud there are two projections, 0 cl, of unequal size and shape, and corresponding, respectively, to the notches in the opposite sides of the eye a, and they are so placed with reference to the lever that its swinging or outer end must be swung into its farthest position from the end of the bolt which is designed to be placed at the edge of the door before the projections will register with the notches in the eye. When in this position the projections can be passed through the front of the case D, after which the lever is free to swing therein, and will fall into the pendent position in which it is represented in Fig. 1, and that end of the chain is securely fastened to the case D. The open chamber in the case is essential, in order to make room for the stud on the pendent lever to enter the case and lock itself upon the front plate thereof. 1 therefore make the bolt C thinner at this point, or with an offset, so that when its outer end is flush with the end of the case it will not interfere with the insertion of the stud b. As in ordinary door-bolts, the office of the bolt 0 is only to bolt the door, and when the door is fastened t by it the chain may also have its end fastened to the case D, to furnish additional security. If the door is then forced open until the chain is taut, the pendent and swinging end of the lever will be drawn toward the edge of the door, and thereby allow the door to he opened thesame distance as if the chain were thelength of the lever longer than it is and were secured directly in front of the eye.

In order to unfasten the chain from the boltcase the lever must be swung back into the position indicated in broken lines in Fig. 1, in

doing which the lever makes one-half of a revolution upon its axis and in effect shortens up the chain by a distance equal to twice the length of the lever, thereby closing the door so far that the chain cannot be unfastened by a person running one arm in from the outside.

I have herein specified two projections on the stud I) of the lever, which construction I prefer; but it is evident that the operation would be the same with only one projection on the stud and one notch in the eye.

In the keeper A, l have shown a round eye or opening in the front and at the left-hand end, into which eye the stud b may be placed, with its projection d hooked over the lower edge of said eye, to hold the lever end of the chain out of the way when it is detached from the bolt-ease D. If desired, instead of a round eye, one of the same form as that in the case D may be made in the keeper.

I am aware that door-bolts and chain-fastenings have heretofore been embodied in one article, and in some cases a button on the end or" the chain was received and held in a longitudinal slot in the front of the case; also, that a prior patent shows a chain-fastening latch in which the chain was fastened to a flat latch, one end of which latch was provided with an eye notched on one side, which received a stud of like form that projected from the front of the base-plate of said latch, whereby the latch could be detached from its base-plate only when its swinging end was thrown into its most remote position from the edge of the door, all of which prior art is hereby diselaimed.

pendent lever having the right-angular stnd 20 b, with side projection, substantially as described.

WILLIAM E. SPARKS.

Witnesses:

JAMES SHEPARD, JOHN EDWARDS, Jr. 

